[wp-trac] [WordPress Trac] #32468: Add Registry Class as WP_App

[WordPress Trac]

#32468: Add Registry Class as WP_App
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 Reporter:  jacobsantos         |       Owner:
     Type:  feature request     |      Status:  new
 Priority:  normal              |   Milestone:  Awaiting Review
Component:  General             |     Version:
 Severity:  normal              |  Resolution:
 Keywords:  dev-feedback early  |     Focuses:
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Comment (by jacobsantos):

 You need a registry to exist, so that classes may start to use it. You
 need classes that use a registry in order for the registry to exist. That
 is an interesting problem.

 '''Note:''' I use "unit tests" below. What I mean is the testing and
 running a single unit at a time. Not the current WordPress test suite
 known as "unit tests" which weren't unit tests.

 Replying to [comment:4 ericlewis]:
 > Hi @jacobsantos, thanks for your proposal! The registry pattern is
 chill, although, as you've hinted at, jamming it into WordPress without
 obvious, practical gains is going to be a non-starter.

 No, I'm pretty sure I listed practical gains that were not obvious. If
 they were obvious, the pattern or a similar or more advanced pattern would
 already be in WordPress. The problem is that writing unit tests produces
 code that is unit testable. Unless you care and write unit tests often,
 then the gains won't be obvious.

 >
 > This would probably be better to consider when we're building out new
 functionality, rather than as a blanket proposal.

 If the environment is using globals for everything, then when will you
 move from globals? The proposal was part of a push to move WordPress to
 use better code that is more testable.

 >
 > You mention
 >
 > > As globals can be replaced now anyway
 >
 > how can globals be replaced without breaking everything?

 Exactly. A plugin could replace a global and either break everything or
 change the behavior. It is also possible to replace a global that is an
 object with a partial implementation that works for the developer, but
 crashes on a client.

 Using a registry along with an interface would provide for a way to ensure
 that all available methods exist for an object. Without having to result
 to the wasteful `if method exists` conditions.

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Ticket URL: <https://core.trac.wordpress.org/ticket/32468#comment:5>
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